US20050287778A1 - Method for forming an ultra-shallow junction in a semiconductor substrate using a nuclear stopping layer - Google Patents
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- US20050287778A1 US20050287778A1 US10/710,241 US71024104A US2005287778A1 US 20050287778 A1 US20050287778 A1 US 20050287778A1 US 71024104 A US71024104 A US 71024104A US 2005287778 A1 US2005287778 A1 US 2005287778A1
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000000758 substrate Substances 0.000 title claims abstract description 30
- 239000004065 semiconductor Substances 0.000 title claims abstract description 27
- 150000002500 ions Chemical class 0.000 claims abstract description 109
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- -1 phosphorus ions Chemical class 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 2
- 229910001439 antimony ion Inorganic materials 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 239000007943 implant Substances 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 15
- 238000005468 ion implantation Methods 0.000 abstract description 9
- 239000002019 doping agent Substances 0.000 description 6
- 229910052787 antimony Inorganic materials 0.000 description 5
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 5
- 150000001462 antimony Chemical class 0.000 description 4
- 238000002513 implantation Methods 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001793 charged compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004151 rapid thermal annealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/26506—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors
- H01L21/26513—Bombardment with radiation with high-energy radiation producing ion implantation in group IV semiconductors of electrically active species
- H01L21/2652—Through-implantation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L21/2658—Bombardment with radiation with high-energy radiation producing ion implantation of a molecular ion, e.g. decaborane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/3115—Doping the insulating layers
- H01L21/31155—Doping the insulating layers by ion implantation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66568—Lateral single gate silicon transistors
- H01L29/66575—Lateral single gate silicon transistors where the source and drain or source and drain extensions are self-aligned to the sides of the gate
Definitions
- the present invention relates to a method for forming an ultra-shallow junction in a semiconductor substrate, and more particularly, to a method for forming an ultra-shallow junction in a semiconductor substrate using a nuclear stopping layer.
- Shallow junction or ultra-shallow junction formation might be one of the most important issues in MOSFET scaling.
- the junction depth of source and drain (S/D) extensions should be reduced as gate length becomes shorter.
- the S/D junction depth for 1.8 micron technology is between 40 nm ⁇ 60 nm, and is between 20 nm ⁇ 40 nm for 0.12 micron technology.
- the conventional methods for the fabrication such as ion implantation and rapid thermal annealing show the limits in satisfying the requirements of the SIA roadmap.
- the antimony dimer implantation process creates a shallow doped junction having a high dopant concentration and a shallow junction depth.
- the antimony dimer ion is extracted from an antimony source material at an extremely low extraction voltage.
- a shallow doped region having a dopant concentration of about 1.0E17 to at least the solid solubility of antimony in silicon (1.0E20 atoms/cm 3 ) is obtained with a junction depth ranging from about 5 to 80 nanometers.
- a method for forming an ultra-shallow junction in a semiconductor substrate is provided.
- a semiconductor substrate having a top surface is prepared.
- a dielectric layer is then formed on the top surface.
- a first ion implantation process is carried out to implant a plurality of heavy ions into the dielectric layer at a first ion range Rp.
- a second ion implantation process is carried out to implant a plurality of less-heavy ions into the dielectric layer at a second ion range Rp.
- the second ion range Rp is smaller than said first ion range Rp.
- a portion of the plural less-heavy ions are decelerated by the previously implanted heavy ions and are implanted into the semiconductor substrate, thereby forming a ultra-shallow junction containing the less-heavy ions. Subsequently, the dielectric layer is completely removed.
- a method for forming an ultra-shallow junction in a semiconductor substrate is provided.
- a semiconductor substrate having a top surface is prepared.
- a dielectric layer is grown on the top surface.
- a plurality of first ions is doped into the dielectric layer at low implant energy to form a nuclear stopping layer in the dielectric layer.
- a plurality of second ions different from the first ions is then doped into the dielectric layer.
- a portion of the second ions traverse the nuclear stopping layer and are therefore decelerated by the first ions.
- the second ions traversing the nuclear stopping layer are implanted into the semiconductor substrate, thereby forming an ultra-shallow junction containing the second ions.
- the dielectric layer is then removed.
- FIG. 1 to FIG. 4 are schematic, cross-sectional diagrams showing a surface portion of a semiconductor substrate where a shallow or ultra-shallow junction is to be formed according to the present invention.
- FIG. 1 to FIG. 4 are schematic, cross-sectional diagrams showing an enlarged surface portion 100 of a semiconductor substrate 10 where a shallow or ultra-shallow junction is to be formed according to the present invention.
- a semiconductor substrate 10 is provided.
- a sacrificial dielectric layer 12 such as a silicon dioxide (SiO 2 ) layer is grown on the surface portion 100 of the semiconductor substrate 10 .
- the sacrificial dielectric layer 12 is grown by thermal methods known in the art, but other semiconductor methods capable of forming such thin dielectric layer may be used.
- the sacrificial dielectric layer 12 has a thickness of about 40 ⁇ 500 ⁇ , more preferably, about 80 ⁇ 400 ⁇ , but not limited thereto.
- a low-energy ion implantation process 30 is carried out.
- a dose of low-energy heavy ions 14 are implanted into the sacrificial dielectric layer 12 to a preselected first ion range Rp.
- an implant energy ranging from 5 ⁇ 40 keV, preferably 10 ⁇ 30 keV, and a dose 2 E15 ⁇ 2E16 atoms/cm 2 , preferably 1E16 atoms/cm 2 , are used, but not limited thereto.
- the peak concentration of the implanted heavy ions 14 is kept in the sacrificial dielectric layer 12 .
- the heavy ions 14 which are mostly distributed in the sacrificial dielectric layer 12 at the depth: first ion range Rp, act as a nuclear stopping layer 16 .
- the heavy ions 14 are antimony ions (Sb + ).
- other heavy ions such as ionic antimony dimers (Sb 2 + ) or arsenic (As + ) may be used (in a NMOS case).
- the heavy ions 14 may be In + , BF 2 + , B 10 H 14 or the like.
- plasma doping or plasma immersion doping methods may be used to substitute the low-energy ion implantation process 30 .
- an ion implantation process 50 is carried out to implant less-heavy ions 24 such as phosphorus ions (P + ) into the sacrificial dielectric layer 12 .
- less-heavy means that the ions 24 have an atomic number that is smaller than the atomic number of the heavy ions 14 .
- the term “less-heavy” means that the ions 24 have a molecular mass that is smaller than the molecular mass of the heavy ions 14 .
- the term “less-heavy” means that the ions 24 (single ions) have an atomic number that is smaller than the molecular mass of the heavy ions 14 (molecular ions). Some of the incident less-heavy ions 24 traverse the nuclear stopping layer 16 . The incident less-heavy ions 24 traversing the nuclear stopping layer 16 end up in the surface portion 100 to form an ultra-shallow junction dopant layer 26 having an average junction depth that is less than 50 nm.
- the implant energy of the ion implantation process 50 depends upon the first ion range Rp of the previously implanted heavy ions 14 .
- the less-heavy ions 24 are implanted into the sacrificial dielectric layer 12 having a peak concentration lying at a second ion range Rp. It is noteworthy that the second ion range Rp is smaller than the first ion range Rp. In other words, the peak concentration of the implanted less-heavy ions 24 lies closer to the upper surface of the sacrificial dielectric layer 12 than the peak concentration of the implanted heavy ions 14 in the sacrificial dielectric layer 12 .
- the projectile energy of the implanted less-heavy ions 24 dissipates due to interactions with electrons of the heavy ions 14 and to glancing collisions with the nuclei of the heavy ions 14 .
- a portion of the less-heavy ions 24 traversing the nuclear stopping layer 16 are decelerated by the heavy ions 14 and are therefore injected into the semiconductor substrate 10 at very low implant energy, thereby forming the shallow junction dopant layer 26 containing the less-heavy ions 24 . It is believed that the majority of the energy loss is caused by electronic stopping, which behaves roughly like friction between the incident ion species and the electron clouds of the heavy ions 14 .
- the depicted portion 100 of the semiconductor substrate 10 may be a source/drain (S/D) extension region of a MOSFET device.
- the gate structure is not shown in figures.
- the S/D extension regions are located next to the gate sidewalls or offset spacers formed on the gate sidewalls.
- the less-heavy ions 24 may be boron ions (B + ).
- the first implant low-energy heavy ion implant
- the second implant may use As + or P + . If the first implant uses As + , the second implant preferably uses P + .
- the first implant may use In + which creates a nuclear stopping layer
- the second implant may use BF 2 + or B + . If the first implant uses BF 2 + , the second implant preferably uses B + .
Abstract
A method for forming an ultra-shallow junction in a semiconductor substrate is provided. A semiconductor substrate having a top surface is prepared. A dielectric layer is then formed on the top surface. A first ion implantation process is carried out to implant a plurality of heavy ions into the dielectric layer at a first ion range Rp. Thereafter, a second ion implantation process is carried out to implant a plurality of less-heavy ions into the dielectric layer at a second ion range Rp. The second ion range Rp is smaller than said first ion range Rp. A portion of the plural less-heavy ions are decelerated by the previously implanted heavy ions and are implanted into the semiconductor substrate, thereby forming a ultra-shallow junction containing the less-heavy ions. Subsequently, the dielectric layer is completely removed.
Description
- 1. Field of the Invention
- The present invention relates to a method for forming an ultra-shallow junction in a semiconductor substrate, and more particularly, to a method for forming an ultra-shallow junction in a semiconductor substrate using a nuclear stopping layer.
- 2. Description of the Prior Art
- Shallow junction or ultra-shallow junction formation might be one of the most important issues in MOSFET scaling. As known in the art, in order to suppress short channel effect, the junction depth of source and drain (S/D) extensions should be reduced as gate length becomes shorter. According to the prediction of SIA roadmap for ULSI technology, the S/D junction depth for 1.8 micron technology is between 40 nm˜60 nm, and is between 20 nm˜40 nm for 0.12 micron technology. However, as device sizes are scaled down more rigorously, the conventional methods for the fabrication such as ion implantation and rapid thermal annealing show the limits in satisfying the requirements of the SIA roadmap.
- Various antimony (Sb) implantation methods have been investigated and have been applied to the fabrication of sub 0.1-micron gate MOSFET devices having ultra-shallow junction depths, since antimony (Sb) ions are heavier and less diffusive than arsenic (As) ions. U.S. Pat. No. 6,191,012 filed Feb. 20, 2001 by Ng, et al., entitled “Method for forming a shallow junction in a semiconductor device using antimony dimer”, teaches an antimony dimer implantation process including steps of ion implanting a molecular antimony dimer (Sb2 +) into a semiconductor substrate. The antimony dimer implantation process creates a shallow doped junction having a high dopant concentration and a shallow junction depth. The antimony dimer ion is extracted from an antimony source material at an extremely low extraction voltage. A shallow doped region having a dopant concentration of about 1.0E17 to at least the solid solubility of antimony in silicon (1.0E20 atoms/cm3) is obtained with a junction depth ranging from about 5 to 80 nanometers.
- U.S. Pat. No. 6,329,704 filed Dec. 11, 2001 by Akatsu, et al., entitled “Ultra-shallow junction dopant layer having a peak concentration within a dielectric layer”, and U.S. Pat. No. 6,387,782 filed May 14, 2002, which is a division application of U.S. Pat. No. 6,329,704, teach a process for forming an ultra-shallow junction depth, doped region within a silicon substrate. The process includes forming a dielectric film on the substrate, then implanting an ionic dopant species into the structure. The profile of the implanted species includes a population implanted through the dielectric film and into the silicon substrate, and a peak concentration deliberately confined in the dielectric film in close proximity to the interface between the dielectric film and the silicon substrate.
- It is the primary object of the present invention to provide a method for forming a shallow junction in a semiconductor substrate using a nuclear stopping layer.
- It is another object of the present invention to provide a method for forming a MOSFET device having ultra-shallow junction S/D extensions.
- According to the claimed invention, a method for forming an ultra-shallow junction in a semiconductor substrate is provided. A semiconductor substrate having a top surface is prepared. A dielectric layer is then formed on the top surface. A first ion implantation process is carried out to implant a plurality of heavy ions into the dielectric layer at a first ion range Rp. Thereafter, a second ion implantation process is carried out to implant a plurality of less-heavy ions into the dielectric layer at a second ion range Rp. The second ion range Rp is smaller than said first ion range Rp. A portion of the plural less-heavy ions are decelerated by the previously implanted heavy ions and are implanted into the semiconductor substrate, thereby forming a ultra-shallow junction containing the less-heavy ions. Subsequently, the dielectric layer is completely removed.
- From one aspect of this invention, a method for forming an ultra-shallow junction in a semiconductor substrate is provided. A semiconductor substrate having a top surface is prepared. A dielectric layer is grown on the top surface. A plurality of first ions is doped into the dielectric layer at low implant energy to form a nuclear stopping layer in the dielectric layer. A plurality of second ions different from the first ions is then doped into the dielectric layer. A portion of the second ions traverse the nuclear stopping layer and are therefore decelerated by the first ions. The second ions traversing the nuclear stopping layer are implanted into the semiconductor substrate, thereby forming an ultra-shallow junction containing the second ions. The dielectric layer is then removed.
- Other objects, advantages and novel features of the invention will become more clearly and readily apparent from the following detailed description when taken in conjunction with the accompanying drawings.
- The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings:
-
FIG. 1 toFIG. 4 are schematic, cross-sectional diagrams showing a surface portion of a semiconductor substrate where a shallow or ultra-shallow junction is to be formed according to the present invention. - Please refer to
FIG. 1 toFIG. 4 .FIG. 1 toFIG. 4 are schematic, cross-sectional diagrams showing an enlargedsurface portion 100 of asemiconductor substrate 10 where a shallow or ultra-shallow junction is to be formed according to the present invention. As shown inFIG. 1 , asemiconductor substrate 10 is provided. A sacrificialdielectric layer 12 such as a silicon dioxide (SiO2) layer is grown on thesurface portion 100 of thesemiconductor substrate 10. Preferably, the sacrificialdielectric layer 12 is grown by thermal methods known in the art, but other semiconductor methods capable of forming such thin dielectric layer may be used. The sacrificialdielectric layer 12 has a thickness of about 40˜500 Å, more preferably, about 80˜400 Å, but not limited thereto. - As shown in
FIG. 2 , a low-energyion implantation process 30 is carried out. A dose of low-energyheavy ions 14 are implanted into the sacrificialdielectric layer 12 to a preselected first ion range Rp. Preferably, an implant energy ranging from 5˜40 keV, preferably 10˜30 keV, and a dose 2E15˜2E16 atoms/cm2, preferably 1E16 atoms/cm2, are used, but not limited thereto. The peak concentration of the implantedheavy ions 14 is kept in the sacrificialdielectric layer 12. Theseheavy ions 14, which are mostly distributed in the sacrificialdielectric layer 12 at the depth: first ion range Rp, act as anuclear stopping layer 16. According to the preferred embodiment of this invention, theheavy ions 14 are antimony ions (Sb+). However, other heavy ions such as ionic antimony dimers (Sb2 +) or arsenic (As+) may be used (in a NMOS case). According to another preferred embodiment of this invention (in a PMOS case), theheavy ions 14 may be In+, BF2 +, B10H14 or the like. Alternatively, plasma doping or plasma immersion doping methods may be used to substitute the low-energyion implantation process 30. - As shown in
FIG. 3 , after forming thenuclear stopping layer 16, according to the preferred embodiment of the present invention, anion implantation process 50 is carried out to implant less-heavy ions 24 such as phosphorus ions (P+) into the sacrificialdielectric layer 12. The term “less-heavy” means that theions 24 have an atomic number that is smaller than the atomic number of theheavy ions 14. In another case, the term “less-heavy” means that theions 24 have a molecular mass that is smaller than the molecular mass of theheavy ions 14. In still another case, the term “less-heavy” means that the ions 24 (single ions) have an atomic number that is smaller than the molecular mass of the heavy ions 14 (molecular ions). Some of the incident less-heavy ions 24 traverse the nuclear stoppinglayer 16. The incident less-heavy ions 24 traversing the nuclear stoppinglayer 16 end up in thesurface portion 100 to form an ultra-shallowjunction dopant layer 26 having an average junction depth that is less than 50 nm. - The implant energy of the
ion implantation process 50 depends upon the first ion range Rp of the previously implantedheavy ions 14. According to the preferred embodiment of this invention, the less-heavy ions 24 are implanted into thesacrificial dielectric layer 12 having a peak concentration lying at a second ion range Rp. It is noteworthy that the second ion range Rp is smaller than the first ion range Rp. In other words, the peak concentration of the implanted less-heavy ions 24 lies closer to the upper surface of thesacrificial dielectric layer 12 than the peak concentration of the implantedheavy ions 14 in thesacrificial dielectric layer 12. - During the implantation, the projectile energy of the implanted less-
heavy ions 24 dissipates due to interactions with electrons of theheavy ions 14 and to glancing collisions with the nuclei of theheavy ions 14. A portion of the less-heavy ions 24 traversing the nuclear stoppinglayer 16 are decelerated by theheavy ions 14 and are therefore injected into thesemiconductor substrate 10 at very low implant energy, thereby forming the shallowjunction dopant layer 26 containing the less-heavy ions 24. It is believed that the majority of the energy loss is caused by electronic stopping, which behaves roughly like friction between the incident ion species and the electron clouds of theheavy ions 14. - As shown in
FIG. 4 , subsequently, thesacrificial dielectric layer 12 containing the nuclear stoppinglayer 16 is etched away. After this, an optional low-thermal budget RTP annealing process may be carried out. It is to be understood that the depictedportion 100 of thesemiconductor substrate 10 may be a source/drain (S/D) extension region of a MOSFET device. The gate structure is not shown in figures. Typically, the S/D extension regions are located next to the gate sidewalls or offset spacers formed on the gate sidewalls. In another embodiment, when the shallow junction is P-type junction, the less-heavy ions 24 may be boron ions (B+). By way of example, for a NMOS process, the first implant (low-energy heavy ion implant) may use Sb+ which creates a nuclear stopping layer, the second implant (less-heavy ion implant) may use As+ or P+. If the first implant uses As+, the second implant preferably uses P+. For a PMOS process, the first implant may use In+ which creates a nuclear stopping layer, the second implant (less-heavy ion implant) may use BF2 + or B+. If the first implant uses BF2 +, the second implant preferably uses B+. - Those skilled in the art will readily observe that numerous modification and alterations of the present invention method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims (9)
1. A method for forming an ultra-shallow junction in a semiconductor substrate, comprising:
providing a semiconductor substrate having a top surface;
forming a dielectric layer on said top surface;
doping a plurality of heavy ions into said dielectric layer at a first ion range Rp;
doping a plurality of less-heavy ions into said dielectric layer at a second ion range Rp, wherein said second ion range Rp is smaller than said first ion range Rp, and wherein a portion of said plural less-heavy ions ae decelerated by said heavy ions and are implanted into said semiconductor substrate, thereby forming an ultra-shallow junction containing said less-heavy ions; wherein said doped heavy ions have a first peak concentration lying in said dielectric layer at said first ion range Rp, and said doped less-heavy ions have a second peak concentration lying in said dielectric layer at said second ion range Rp; and
removing said dielectric layer.
2. The method according to claim 1 wherein said dielectric layer is a silicon dioxide layer.
3. The method according to claim 2 wherein said silicon dioxide layer has a thickness of less than 400 angstroms
4. The method according to claim 1 wherein said heavy ions are antimony ions (Sb+), and said less-heavy ions are As+ or phosphorus ions (P+).
5. The method according to claim 1 wherein said heavy ions are In+, and said less-heavy ions are BF2 + or boron ions (B+).
6. (canceled)
7. The method according to claim 1 wherein said semiconductor substrate is a silicon substrate, and said top surface is an exposed silicon surface.
8. The method according to claim 1 wherein after removing said dielectric layer, the method further comprises the following step:
annealing said semiconductor substrate.
9-17. (canceled)
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CN103871814A (en) * | 2012-12-14 | 2014-06-18 | 中国科学院微电子研究所 | Semiconductor ultra shallow junction preparation method |
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CN102087961B (en) * | 2009-12-04 | 2012-10-31 | 中芯国际集成电路制造(上海)有限公司 | P type doping ultra shallow junction and method for making P-channel metal oxide semiconductor (PMOS) transistor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6191012B1 (en) * | 1998-12-03 | 2001-02-20 | Advanced Micro Devices | Method for forming a shallow junction in a semiconductor device using antimony dimer |
US6329704B1 (en) * | 1999-12-09 | 2001-12-11 | International Business Machines Corporation | Ultra-shallow junction dopant layer having a peak concentration within a dielectric layer |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6191012B1 (en) * | 1998-12-03 | 2001-02-20 | Advanced Micro Devices | Method for forming a shallow junction in a semiconductor device using antimony dimer |
US6329704B1 (en) * | 1999-12-09 | 2001-12-11 | International Business Machines Corporation | Ultra-shallow junction dopant layer having a peak concentration within a dielectric layer |
US6387782B2 (en) * | 1999-12-09 | 2002-05-14 | International Business Machines Corporation | Process of forming an ultra-shallow junction dopant layer having a peak concentration within a dielectric layer |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103871814A (en) * | 2012-12-14 | 2014-06-18 | 中国科学院微电子研究所 | Semiconductor ultra shallow junction preparation method |
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